You wake up at 6 am feeling achy and chilled. Unsure if you’re sick or just sleep-deprived, you reach for a thermometer. It beeps at 99°F, so you groan and roll out of bed and get ready for work.

Fevers will typically go away within a few days. Medications, staying hydrated, and getting plenty of rest can help relieve symptoms. Medical care may be needed for severe fevers, or for infants ...